Although I cannot guarantee the results of this method, you can use a finbox to cast the base. This applies to Powerbox and Tuttle (+Deep Tuttle) fins. Trimbox fins can't be cast in their box as the box doesn't have the fin's shape. Make sure your finbox is waxed well and the screw holes are sealed with plasticine before casting with thickened resin or epoxy putty. You will also have to figure out a way to keep your fin vertical in respect to the level of the finbox. Another detail you will need to figure out is how to place the screw nuts in position, since casting with the screws in place is no easy task.

For our 100 or 110 mm chords, the 160mm box will clearly be over dimensionned.

3G composites (Ketos by Orana) have developped their own box based on morse cone sections around 5 degrees (versus 6 for the tuttle box wall).AlpineFoil use this setup on the 5.0 board version with the Courtesy of 3G composites.

Although I cannot guarantee the results of this method, you can use a finbox to cast the base. This applies to Powerbox and Tuttle (+Deep Tuttle) fins. Trimbox fins can't be cast in their box as the box doesn't have the fin's shape. Make sure your finbox is waxed well and the screw holes are sealed with plasticine before casting with thickened resin or epoxy putty. You will also have to figure out a way to keep your fin vertical in respect to the level of the finbox. Another detail you will need to figure out is how to place the screw nuts in position, since casting with the screws in place is no easy task.

This works well. http://kiteracing.com/Pot_a_Fin.htmlIf you look into the background of some of the rista fins videos you can see a similar jig so I suspect this is (sorta) how the pros do it.

I would recommend adding a second nut onto the bolt you put in. so that is fully encased. in the epoxy and cannot pull out.

Epoxy/milled glass powder can work as a casting agent, if you don't have a urethane kicking around. I also recommend locktite frekote as a mold release, If you can't get the crap these guys are using wax doesn't work well on the best of days and is miserable to apply to the inside of a fin box.

The Tuttle box used by raceboards should work, I just can not find them in the States for sale.Anyone knows where to buy them?

Mahalo

EDIT: found the cheaper one further down the pageYes I have one at home I bought from:http://www.fiberglasssupply.com/Product ... #SailboardGet the plastic oneR54-4561Chinook "Tuttle" Plastic Race Box, Chinook (#305)$16.26

The Tuttle box used by raceboards should work, I just can not find them in the States for sale.Anyone knows where to buy them?

Mahalo

EDIT: found the cheaper one further down the pageYes I have one at home I bought from:http://www.fiberglasssupply.com/Product ... #SailboardGet the plastic oneR54-4561Chinook "Tuttle" Plastic Race Box, Chinook (#305)$16.26

They have all kinds of other box and glassing supplies too.

do you have the dimensions ? There seem to be none on the internet even on Chinook's own website.

Sorry, my Private Message box does not allow me to reply, it only let me post it to the outbox and stayed there.

Stan:

You should check out my older posts, most of the information are listed, my research is still ongoing, when i finally finish the project, I will post the details on how to make one. Sent: Wed Nov 13, 2013 5:24 pmView message Reply with quote

oldkiterMessage subject: Your foil boardFolder: InboxI showed your video on your homemade foil board to a friend and he wants to make one for himself - he was very impressed. Can you provide some more specific info other than that on your description with the video.

the foil would closely match the stuffness numbers provided by Europ2 in his thread.weight of strut would be approx 2.7 lbs

personally, i doubt the foil needs to have any specific profile.naca, ellipse, circular arcs... as long as it's streamlined.i wonder how much laterall lift (from the strut) the rider could actually tolerate while standing on top of the entire mess. ( i'm guessing that its not much)i'd certainly like to hear from folks that know better.-bill

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